Stop for phonographs



March 18 1924.

B. B- BLOOD STOP FOR PHONOGRAPHS Filed 0ct.. 21 1920' Patented Mar. l192d.

Bean 3. BLOOD, or cnronco, iLLrne-rs,

hath

nssienoa, BY ransnn Assron niirs, 'ro

ILLINOIS.

s'ror roa riionoenarns.

Application filed October 21, 1920. ,Serial No. 418,446.

To all whom it may concern:

Be it known that I, BURR B. BLooD, a citizen of the United States, and aresident of Chicago, in the county of Cook and State of Illinois, haveinvented certain new and usei'ul Improvements in Stops for Phonographs,of which the following is a description, reference being had to theaccompanying drawing, which forms part of my specification.

My invention has for its object the provision of a construction which issimple in operation; inexpensive in construction and which can bereadily applied to phonographs for the purpose of automaticallyarresting the rotation of the turn-table when the tonearm of thephonograph has reached a predetermined point in its lateral oscillationtransversely of the record of the turn-table.

The purpose of my invention is to provide a device which may be attachedon top of the motor-board of the phonograph-cabinet at a point adjacentto the turn-table without necessitating any reconstruction of thephonograph mechanism or the addition or attachment of any mechanism tothe tonearm of the phonograph. 7

One object of my invention is to provide a stop which will not only beautomatic in so far as the application of the brake or stopping elementis concerned when the tone-arm reaches a predetermined point in itstravel, but which will also be automatically set in tripping positionwhen the brake or stopping member is moved out oi braking relation withthe turn-table; the tripping element of the device permitting of suchnice adjustment that actuation of the bralre element or stop willpositively be induced when the tone-arm has reached a predeterminedpoint in its transverse travel, thus adapting the device to varyingsized records; the con struction being such that the stop may beaccurately adjusted to any record without incurring any lost motion orexcess rota tion of the turn-table.

The objects and advantages of my invention will be more readilycomprehended from a detailed description of the accompanying drawing,wherein Figure 1 is a plan view of the sound con-v veyor or tone-arm anda reproducer attached thereto, and also of my improved stop which with arecord thereon, being shown.

Figure 2 is a side elevation of my improved. stop with certain portionsshown broken away.

Figure 3 is a plan view thereof illustrating the stop in released orbrakingposition.

Figure 4 is a plan view of the same showing the stop in set ornon-braking position.

in the particular exemplification of the invention as disclosed inFigure 1, my improved stop device is shown applied on top of themotor-board of a phonograph ata point adjacent to the turn-table onwhich the usual disc or record is placed so as to be traversed by thesound-box or reproducer 11 secured to the outer end of the soundconveyor 0i: tone-arm 12 which is oscillatingly mounted at its base, ina well known manner, on the motor-board of the phonograph cabinet so asto permit oscillatory movement of the tone-arm or sound conveyor fromthe initial or starting point, indicated in dotted lines, to thermal orstopping point adjacent the center of the turn-table indicated in fulllines.

The device comprises a suitable base plate 13 adapted to be securedflush with the motor-board in any suitable manner, as for example byscrews as at 14; the base plate being arranged at a point in proximityto the turn-table and the base or swiveled point of the tone-arm asshown in Figure}, so that the brake-shoe or lug 15 of the brakelever 16may come into frictional contact with the periphery of the turn-table.The brake-lever 16 is pivotally mounted at 17 on the base plate 13 andis provided with a hand lever portion 18 whereby the brakelever maybemoved into releasing position. The brake-lever is automatically movedinto braking position, when released, by means of a suitable spring 19;one end whereof is shown secured to a suitable lug or pin 20 on the baseplate 13, while the other end of the spring is secured to a lug 21arranged on the brake-lever at a point intermediate of the pivotal point17 of the lever-and the brake-shoe or end 15 thereof; the springexerting a constant pull on the brake-lever so as to move the same intothe braking position indicated in Figure 3 when the tripping circleconcentric with that described by the arcuate finger 22, so as to permitthe sliding relation of end 24 within the are described by arcuatefinger 22. The arcuate end 24 is maintained in intimate relation withthe arcuate finger 22 (when the brake is in released position) by asuitable lug 26 disposed upwardly from base plate 13. The trip member 25is shown secured to the lower end of a tube or sleeve 27 so as tooscillate therewith and the tube or sleeve 27 in turn is arranged infrictional contact about the vertically disposed crank-shaped rod 28,which, at a pointabove the top of the sleeve or tube 27 is disposedhorizontally so as to extend beneath the sound-conveyor or tonearm 12and permit the latter to have its lateral movement. The rod 28terminates in a vertically disposed portion 29 which is adapted toextend into the path of the sound conveyor or tone-arm 12 and to beengaged thereby. The trip member 25 with sleeve 27 is pivotally securedto the base plate 13 so as to permit slight rotative movement thereof;and with the trip arm or rod 28 in frictional contact with the sleeve27, it is evident that when the tone-arm 12 engages the upper off-setend 29 of the tripper rod, that slight rotative movement is imparted tosleeve 27 which in turn oscillates the tripper arm 25 out of holdingengagement with the notched end of arcuate finger 22 of the brake-lever,thereby releasing the latter so as to bring the action of spring 19 intoplay, which will force the brake-shoe portion 15 into holding relationwith the turntable of the phonograph.

As shown in Figure 1, the tripper rod 28 is moved so as to have thehorizontally disposed intermediate portion thereof disposed somewhattangentially to the turn-table, as shown in dotted lines, so as to bringthe upper end 29 of the rod into position where it will be engaged bythe tone-arm 12 when the stylus of the reproducer has reached the lastor pro-selected groove of the record provided with the recordedindentations.

With my improved construction, it is apparent that the stop device maybe set to apply the brake at any desired point by simply moving theupper end 29 of the tripper rod 28 into such vertical position where thetone-arm will engage therewith when the stylus of the reproducer hasreached the desired point; the movement of the tripper rod, asdescribed, being possible because of its frictional relation with thetube or sleeve 27; the frictional relation, however, being such as notto be affected by the contact of the tone-arm so far as its relationwith the tube 27 is concerned. WVhen the tone-arm engages the upstandingportion 29 of the tripper rod, it will cause slight rotation of sleeve27 and in turn oscillate the arm 25 in a direction away from the notchedend of arcuate finger 22, namely toward the lug or stop 26, as shown inFigure 3.

With my improved construction, it is unnecessary to change theconstruction of the usual tone-arm or to provide it with a trippingmember or attachment; the brake and tripping mechanism of myconstruction constitutes a single unit or device which may be readilyapplied to any type of phonograph; while the tripper rod or element maybe quickly adjusted to any sized record, with the adjustment being suchthat it will promptly release the brake and stop rotation of theturn-table at the desired point without necessitating additional orunnecessary rotations of the turn-table beyond the last or pre-selectedgroove provided with the recorded indentations.

The brake-lever 16 and the tripper arm 25 are so positioned and relatedthat the tripping mechanism will be automatically placed in position tomaintain the brake in inoperative position, by simply grasping the handportion 18 of the brake-lever and oscillating the lever about itspivotal point 17 in a direction to move the brake-shoe away from theturn-table and to an extent sufficient to have the brake-shoe end of thelever engage with the tripper arm 25, at which time the curved ornotched finger 22 will be in a position to receive the end 2a of tripperarm 25; the latter being forced over by the brake-shoe end of the lever16 and engaging in the notch of finger 22 the moment hand portion 18 ofthe brake-lever is released. Such positioning of the brake-lever at thesame time distends spring 19 and increases the pull on the brake-leverwhich will cause the latter to rapidly move into braking position whenthe .arcuate end 24 of tripper bar 25 is moved out of abutting relationwith the finger 22. It is evident, therefore, that a resetting of thebrake or tripping mechanism is therefore automatically accomplished inthe single operation of the brakeshoe out of braking contact with theturntable.

I have shown and described what I believe to be the simplest and bestexemplification of my invention, but modifications may be made incertain details of construction without, however, departing from thespirit of my invention. I

lOO

messes Y -What I claim and wish to secure by Letters Patent is 1'. 1Astop of the class described, comprising a base plate, a brake leverpivoted intermediate of its ends on the base plate and provided with aturn-table engaging portion while the other end constitutes a handlever, the hand lever portion being provided with an arcuate extensionconcentric with the pivotal point of the lever, a spring secured at oneend to the base plate while the other end is secured to said leveradjacent the turn-table engaging portion thereof, a trip memberpivotally secured on the base plate adjacent to the turntable engagingend of said lever, said trip member being adapted to form holdingrelation with said arcuate extension, and tone-arm engaging means havingadjustable relation with said trip member and adapted to causeoscillation of the latter away from said arcuate extension when saidmeans is engaged "by the tonearm.

2. A stop of the character described, comprising a pivoted brake-leverprovided with an arcuate extension, a trip member adapted to be actuatedby the tone-armof a phonograph when said tone-arm reachesa prearrangedpoint, said member being pivoted and provided with an arcuate endadapted to engage with the arcuate extension of the brake-lever to holdthe same in non-braking position, the arcuate extension of thebrake-lever and the arcuate end of said trip member being arranged tomove in concentric relation with each other so that movement in onedirection of the brakelever will cause the trip member to be moved intoholding engagement with the brakelever, and means whereby thebrake-lever will be forced into braking position.

3. A stopiof the character described, co1nprising a pivoted brake-leverprovided with an arcuate extension adjacent the pivotal point thereof, atrip member adapted to be actuated by the tone-arm when the latterreaches a prearranged point, said member being pivoted and provided withan arcuate end disposed concentrically with the arcuate extension of thebrake-lever and adapted to engage with said arcuate extension to holdthe brake-lever in non-braking position, the relation between thearcuate portions being such that movement of the brake-lever in onedirection will cause the trip member to move into holding engagementtherewith, means adapted to limit the movement of the brake-lever andtrip member, and means whereby the brake-lever will be forced intobraking position.

4:. A stop of the character described, comprising a brake-lever pivotedto move through the arc of a horizontally disposed circle, a trip memberpivoted to move through an oppositely facing are of a horizontallydisposed circle, one end thereof be ing adapted to form holding relationwith said brake-lever, the relation between the brake-lever and tripmember being such that movement of the brake-lever into nonbrakingposition will cause the brake portion thereof to force the trip memberinto holding relation with the portion of the brake-lever disposed onthe opposite side of its pivot point, means adjustably secured to saidtrip member and to be engaged by the traveling member of the phonograph,and means whereby the brake-lever is forced into braking position whensaid trip member is actuated by the traveling member through the mediumof said adjustable means.

5. stop of the character described, comprising a brake-lever pivotedintermediate of its ends and provided with an off-set portion describingan arc concentric with the pivotal point of said lover, a trip memberpivotally secured beyond the brake-end of said lever and provided withan arcuate end arranged concentric with the offset portion of the leverand adapted to have abutting relation with the end of the off-setportion of the lever and thereby holdthe latter in nonbraking position,the relation between the brakedever and trip member being such thatmovement of the brake-lever into non-braking position will force saidtrip member into holding relation therewith, means, adapted to limit themovement of the brake-lever and trip member, means adjustably secured tothe trip member and adapted to be engaged by the traveling member of aphonograph when the latter reaches a prearranged point, and meanswhereby the brake-lever will be forced into braking position when thetrip member is forced out of holding relation therewith through themedium of said adjustable means.

6. A stop of the character described, comprising a brake-lever pivotedintermediate of its ends, one end constituting a turn-table engagingportion while the other constitutes a hand lever, a pivoted trip memberadapted to hold the brake-lever in non-braking position, the relationbetween the brake-lever and the trip member being such that movement ofthe brake-lever about its pivotal point into non-braking position willcause the turn-table engaging portion of said lever to force the tripmember into holding relation therewith, means adjustably secured to thetrip member and adapted to be engaged by the traveling member of aphonograph when the traveling member reaches a prearranged point, andmeans whereby the brake-lever will be forced into braking position whensaid trip member is actuated through the medium of said adjustablemeans.

7. A etc of the character described, comprising a ase-plate, abrake-lever pivoted tween the brake-lever and trip member being suchthat movement of the brakedever into nonbraking position will force thetrip member into holding relation therewith, means whereby the tripmember and brakemember will be maintained in intimate relation with eachother, a tone-arm engaging member having adjustable relation with thetrip member whereby the latter is moved out of holding relation with thebrake-member when the tone-arm reaches a predetermined point in itstravel, and a spring secured to the base-plate and to said brak'eleveradapted to force the latter into holding relation with the turntable.

8. A stop of the character described, comprising a base plate, abrake-lever pivoted intermediate of its ends on the base plate, one endof said lever constituting a turntable engaging portion while the otherconstitutes a hand-lever, the hand-lever por tion being provided with anarcuate extension formed concentric with the pivotal point of saidbrake-lever, a trip member pivoted on the base plate and provided withan arcuate end arranged concentric with the arcuate extension of thebrake-lever and normally in sliding relation therewith, the relationbetween the trip member and brake lever being such that movement of theturntable engaging portion of the brake-lever into non-braking positionwill cause said portion to engage the trip member and force it intoholding relation with the areuate eX- tension of tne brakedever, meanshaving adjustable relation with the trip member and adapted to beactuated by the traveling member of the phonograph when the latterreaches a predetermined point in its travel, whereby the trip memberwill be moved out of holding relation with the brake-member, and meanswhereby the turn-table engaging portion of the brake-lever will beforced into holding relation With the turn-table when released by thetrip member.

BURR B. BLOOD. Witnesses G. HEIDMAN, N. A. STREET.

